. >> talking there obviously about a september 11, 2012 when the benghazi attack happened. president obama said this week that he was, quote, not familiar with the idea that anyone was being prevented from telling their benghazi story. here is the state department on the benghazi investigation yesterday. >> the whole family is committed to bringing those who perpetrated this attack to justice and doing everything we need to do to keep our people safe. that's where our attention is. we hope that congress and the media, too, can keep the focus on that. >> but republican congressman darrell issa, who chairs the house committee holding this hearing, says some additional witnesses are hesitating to come forward because they fear they may be punished by their employers. rick? >> molly henneberg in washington, thank you very much. for more exclusive details on these break developments, tune in to fox news sunday tomorrow when chris wallace sits down with the utah congressman, jason chaffetz, one of those questioning the whistle blowers. >>> new developments in the middle east. isr